Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik...
[linux-2.6] / drivers / net / arm / ether3.c
1 /*
2  *  linux/drivers/acorn/net/ether3.c
3  *
4  *  Copyright (C) 1995-2000 Russell King
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  * SEEQ nq8005 ethernet driver for Acorn/ANT Ether3 card
11  *  for Acorn machines
12  *
13  * By Russell King, with some suggestions from borris@ant.co.uk
14  *
15  * Changelog:
16  * 1.04 RMK     29/02/1996      Won't pass packets that are from our ethernet
17  *                              address up to the higher levels - they're
18  *                              silently ignored.  I/F can now be put into
19  *                              multicast mode.  Receiver routine optimised.
20  * 1.05 RMK     30/02/1996      Now claims interrupt at open when part of
21  *                              the kernel rather than when a module.
22  * 1.06 RMK     02/03/1996      Various code cleanups
23  * 1.07 RMK     13/10/1996      Optimised interrupt routine and transmit
24  *                              routines.
25  * 1.08 RMK     14/10/1996      Fixed problem with too many packets,
26  *                              prevented the kernel message about dropped
27  *                              packets appearing too many times a second.
28  *                              Now does not disable all IRQs, only the IRQ
29  *                              used by this card.
30  * 1.09 RMK     10/11/1996      Only enables TX irq when buffer space is low,
31  *                              but we still service the TX queue if we get a
32  *                              RX interrupt.
33  * 1.10 RMK     15/07/1997      Fixed autoprobing of NQ8004.
34  * 1.11 RMK     16/11/1997      Fixed autoprobing of NQ8005A.
35  * 1.12 RMK     31/12/1997      Removed reference to dev_tint for Linux 2.1.
36  *      RMK     27/06/1998      Changed asm/delay.h to linux/delay.h.
37  * 1.13 RMK     29/06/1998      Fixed problem with transmission of packets.
38  *                              Chip seems to have a bug in, whereby if the
39  *                              packet starts two bytes from the end of the
40  *                              buffer, it corrupts the receiver chain, and
41  *                              never updates the transmit status correctly.
42  * 1.14 RMK     07/01/1998      Added initial code for ETHERB addressing.
43  * 1.15 RMK     30/04/1999      More fixes to the transmit routine for buggy
44  *                              hardware.
45  * 1.16 RMK     10/02/2000      Updated for 2.3.43
46  * 1.17 RMK     13/05/2000      Updated for 2.3.99-pre8
47  */
48
49 #include <linux/module.h>
50 #include <linux/kernel.h>
51 #include <linux/sched.h>
52 #include <linux/types.h>
53 #include <linux/fcntl.h>
54 #include <linux/interrupt.h>
55 #include <linux/ptrace.h>
56 #include <linux/ioport.h>
57 #include <linux/in.h>
58 #include <linux/slab.h>
59 #include <linux/string.h>
60 #include <linux/errno.h>
61 #include <linux/netdevice.h>
62 #include <linux/etherdevice.h>
63 #include <linux/skbuff.h>
64 #include <linux/device.h>
65 #include <linux/init.h>
66 #include <linux/delay.h>
67 #include <linux/bitops.h>
68
69 #include <asm/system.h>
70 #include <asm/ecard.h>
71 #include <asm/io.h>
72
73 static char version[] __initdata = "ether3 ethernet driver (c) 1995-2000 R.M.King v1.17\n";
74
75 #include "ether3.h"
76
77 static unsigned int net_debug = NET_DEBUG;
78
79 static void     ether3_setmulticastlist(struct net_device *dev);
80 static int      ether3_rx(struct net_device *dev, unsigned int maxcnt);
81 static void     ether3_tx(struct net_device *dev);
82 static int      ether3_open (struct net_device *dev);
83 static int      ether3_sendpacket (struct sk_buff *skb, struct net_device *dev);
84 static irqreturn_t ether3_interrupt (int irq, void *dev_id, struct pt_regs *regs);
85 static int      ether3_close (struct net_device *dev);
86 static struct net_device_stats *ether3_getstats (struct net_device *dev);
87 static void     ether3_setmulticastlist (struct net_device *dev);
88 static void     ether3_timeout(struct net_device *dev);
89
90 #define BUS_16          2
91 #define BUS_8           1
92 #define BUS_UNKNOWN     0
93
94 /* --------------------------------------------------------------------------- */
95
96 typedef enum {
97         buffer_write,
98         buffer_read
99 } buffer_rw_t;
100
101 /*
102  * ether3 read/write.  Slow things down a bit...
103  * The SEEQ8005 doesn't like us writing to its registers
104  * too quickly.
105  */
106 static inline void ether3_outb(int v, const void __iomem *r)
107 {
108         writeb(v, r);
109         udelay(1);
110 }
111
112 static inline void ether3_outw(int v, const void __iomem *r)
113 {
114         writew(v, r);
115         udelay(1);
116 }
117 #define ether3_inb(r)           ({ unsigned int __v = readb((r)); udelay(1); __v; })
118 #define ether3_inw(r)           ({ unsigned int __v = readw((r)); udelay(1); __v; })
119
120 static int
121 ether3_setbuffer(struct net_device *dev, buffer_rw_t read, int start)
122 {
123         int timeout = 1000;
124
125         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
126         ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
127
128         while ((ether3_inw(REG_STATUS) & STAT_FIFOEMPTY) == 0) {
129                 if (!timeout--) {
130                         printk("%s: setbuffer broken\n", dev->name);
131                         priv(dev)->broken = 1;
132                         return 1;
133                 }
134                 udelay(1);
135         }
136
137         if (read == buffer_read) {
138                 ether3_outw(start, REG_DMAADDR);
139                 ether3_outw(priv(dev)->regs.command | CMD_FIFOREAD, REG_COMMAND);
140         } else {
141                 ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
142                 ether3_outw(start, REG_DMAADDR);
143         }
144         return 0;
145 }
146
147 /*
148  * write data to the buffer memory
149  */
150 #define ether3_writebuffer(dev,data,length)                     \
151         writesw(REG_BUFWIN, (data), (length) >> 1)
152
153 #define ether3_writeword(dev,data)                              \
154         writew((data), REG_BUFWIN)
155
156 #define ether3_writelong(dev,data)      {                       \
157         void __iomem *reg_bufwin = REG_BUFWIN;                  \
158         writew((data), reg_bufwin);                             \
159         writew((data) >> 16, reg_bufwin);                       \
160 }
161
162 /*
163  * read data from the buffer memory
164  */
165 #define ether3_readbuffer(dev,data,length)                      \
166         readsw(REG_BUFWIN, (data), (length) >> 1)
167
168 #define ether3_readword(dev)                                    \
169         readw(REG_BUFWIN)
170
171 #define ether3_readlong(dev)                                    \
172         readw(REG_BUFWIN) | (readw(REG_BUFWIN) << 16)
173
174 /*
175  * Switch LED off...
176  */
177 static void ether3_ledoff(unsigned long data)
178 {
179         struct net_device *dev = (struct net_device *)data;
180         ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
181 }
182
183 /*
184  * switch LED on...
185  */
186 static inline void ether3_ledon(struct net_device *dev)
187 {
188         del_timer(&priv(dev)->timer);
189         priv(dev)->timer.expires = jiffies + HZ / 50; /* leave on for 1/50th second */
190         priv(dev)->timer.data = (unsigned long)dev;
191         priv(dev)->timer.function = ether3_ledoff;
192         add_timer(&priv(dev)->timer);
193         if (priv(dev)->regs.config2 & CFG2_CTRLO)
194                 ether3_outw(priv(dev)->regs.config2 &= ~CFG2_CTRLO, REG_CONFIG2);
195 }
196
197 /*
198  * Read the ethernet address string from the on board rom.
199  * This is an ascii string!!!
200  */
201 static int __init
202 ether3_addr(char *addr, struct expansion_card *ec)
203 {
204         struct in_chunk_dir cd;
205         char *s;
206         
207         if (ecard_readchunk(&cd, ec, 0xf5, 0) && (s = strchr(cd.d.string, '('))) {
208                 int i;
209                 for (i = 0; i<6; i++) {
210                         addr[i] = simple_strtoul(s + 1, &s, 0x10);
211                         if (*s != (i==5?')' : ':' ))
212                                 break;
213                 }
214                 if (i == 6)
215                         return 0;
216         }
217         /* I wonder if we should even let the user continue in this case
218          *   - no, it would be better to disable the device
219          */
220         printk(KERN_ERR "ether3: Couldn't read a valid MAC address from card.\n");
221         return -ENODEV;
222 }
223
224 /* --------------------------------------------------------------------------- */
225
226 static int __init
227 ether3_ramtest(struct net_device *dev, unsigned char byte)
228 {
229         unsigned char *buffer = kmalloc(RX_END, GFP_KERNEL);
230         int i,ret = 0;
231         int max_errors = 4;
232         int bad = -1;
233
234         if (!buffer)
235                 return 1;
236
237         memset(buffer, byte, RX_END);
238         ether3_setbuffer(dev, buffer_write, 0);
239         ether3_writebuffer(dev, buffer, TX_END);
240         ether3_setbuffer(dev, buffer_write, RX_START);
241         ether3_writebuffer(dev, buffer + RX_START, RX_LEN);
242         memset(buffer, byte ^ 0xff, RX_END);
243         ether3_setbuffer(dev, buffer_read, 0);
244         ether3_readbuffer(dev, buffer, TX_END);
245         ether3_setbuffer(dev, buffer_read, RX_START);
246         ether3_readbuffer(dev, buffer + RX_START, RX_LEN);
247
248         for (i = 0; i < RX_END; i++) {
249                 if (buffer[i] != byte) {
250                         if (max_errors > 0 && bad != buffer[i]) {
251                                 printk("%s: RAM failed with (%02X instead of %02X) at 0x%04X",
252                                        dev->name, buffer[i], byte, i);
253                                 ret = 2;
254                                 max_errors--;
255                                 bad = i;
256                         }
257                 } else {
258                         if (bad != -1) {
259                                 if (bad != i - 1)
260                                         printk(" - 0x%04X\n", i - 1);
261                                 printk("\n");
262                                 bad = -1;
263                         }
264                 }
265         }
266         if (bad != -1)
267                 printk(" - 0xffff\n");
268         kfree(buffer);
269
270         return ret;
271 }
272
273 /* ------------------------------------------------------------------------------- */
274
275 static int __init ether3_init_2(struct net_device *dev)
276 {
277         int i;
278
279         priv(dev)->regs.config1 = CFG1_RECVCOMPSTAT0|CFG1_DMABURST8;
280         priv(dev)->regs.config2 = CFG2_CTRLO|CFG2_RECVCRC|CFG2_ERRENCRC;
281         priv(dev)->regs.command = 0;
282
283         /*
284          * Set up our hardware address
285          */
286         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
287         for (i = 0; i < 6; i++)
288                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
289
290         if (dev->flags & IFF_PROMISC)
291                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
292         else if (dev->flags & IFF_MULTICAST)
293                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
294         else
295                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
296
297         /*
298          * There is a problem with the NQ8005 in that it occasionally loses the
299          * last two bytes.  To get round this problem, we receive the CRC as
300          * well.  That way, if we do lose the last two, then it doesn't matter.
301          */
302         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
303         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
304         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
305         ether3_outw(0, REG_TRANSMITPTR);
306         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
307         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
308         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
309         ether3_outw(priv(dev)->regs.command, REG_COMMAND);
310
311         i = ether3_ramtest(dev, 0x5A);
312         if(i)
313                 return i;
314         i = ether3_ramtest(dev, 0x1E);
315         if(i)
316                 return i;
317
318         ether3_setbuffer(dev, buffer_write, 0);
319         ether3_writelong(dev, 0);
320         return 0;
321 }
322
323 static void
324 ether3_init_for_open(struct net_device *dev)
325 {
326         int i;
327
328         memset(&priv(dev)->stats, 0, sizeof(struct net_device_stats));
329
330         /* Reset the chip */
331         ether3_outw(CFG2_RESET, REG_CONFIG2);
332         udelay(4);
333
334         priv(dev)->regs.command = 0;
335         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
336         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
337                 barrier();
338
339         ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
340         for (i = 0; i < 6; i++)
341                 ether3_outb(dev->dev_addr[i], REG_BUFWIN);
342
343         priv(dev)->tx_head      = 0;
344         priv(dev)->tx_tail      = 0;
345         priv(dev)->regs.config2 |= CFG2_CTRLO;
346         priv(dev)->rx_head      = RX_START;
347
348         ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
349         ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
350         ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
351         ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
352         ether3_outw(0, REG_TRANSMITPTR);
353         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
354         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
355
356         ether3_setbuffer(dev, buffer_write, 0);
357         ether3_writelong(dev, 0);
358
359         priv(dev)->regs.command = CMD_ENINTRX | CMD_ENINTTX;
360         ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
361 }
362
363 static inline int
364 ether3_probe_bus_8(struct net_device *dev, int val)
365 {
366         int write_low, write_high, read_low, read_high;
367
368         write_low = val & 255;
369         write_high = val >> 8;
370
371         printk(KERN_DEBUG "ether3_probe: write8 [%02X:%02X]", write_high, write_low);
372
373         ether3_outb(write_low, REG_RECVPTR);
374         ether3_outb(write_high, REG_RECVPTR + 4);
375
376         read_low = ether3_inb(REG_RECVPTR);
377         read_high = ether3_inb(REG_RECVPTR + 4);
378
379         printk(", read8 [%02X:%02X]\n", read_high, read_low);
380
381         return read_low == write_low && read_high == write_high;
382 }
383
384 static inline int
385 ether3_probe_bus_16(struct net_device *dev, int val)
386 {
387         int read_val;
388
389         ether3_outw(val, REG_RECVPTR);
390         read_val = ether3_inw(REG_RECVPTR);
391
392         printk(KERN_DEBUG "ether3_probe: write16 [%04X], read16 [%04X]\n", val, read_val);
393
394         return read_val == val;
395 }
396
397 /*
398  * Open/initialize the board.  This is called (in the current kernel)
399  * sometime after booting when the 'ifconfig' program is run.
400  *
401  * This routine should set everything up anew at each open, even
402  * registers that "should" only need to be set once at boot, so that
403  * there is non-reboot way to recover if something goes wrong.
404  */
405 static int
406 ether3_open(struct net_device *dev)
407 {
408         if (!is_valid_ether_addr(dev->dev_addr)) {
409                 printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
410                         dev->name);
411                 return -EINVAL;
412         }
413
414         if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
415                 return -EAGAIN;
416
417         ether3_init_for_open(dev);
418
419         netif_start_queue(dev);
420
421         return 0;
422 }
423
424 /*
425  * The inverse routine to ether3_open().
426  */
427 static int
428 ether3_close(struct net_device *dev)
429 {
430         netif_stop_queue(dev);
431
432         disable_irq(dev->irq);
433
434         ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
435         priv(dev)->regs.command = 0;
436         while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
437                 barrier();
438         ether3_outb(0x80, REG_CONFIG2 + 4);
439         ether3_outw(0, REG_COMMAND);
440
441         free_irq(dev->irq, dev);
442
443         return 0;
444 }
445
446 /*
447  * Get the current statistics.  This may be called with the card open or
448  * closed.
449  */
450 static struct net_device_stats *ether3_getstats(struct net_device *dev)
451 {
452         return &priv(dev)->stats;
453 }
454
455 /*
456  * Set or clear promiscuous/multicast mode filter for this adaptor.
457  *
458  * We don't attempt any packet filtering.  The card may have a SEEQ 8004
459  * in which does not have the other ethernet address registers present...
460  */
461 static void ether3_setmulticastlist(struct net_device *dev)
462 {
463         priv(dev)->regs.config1 &= ~CFG1_RECVPROMISC;
464
465         if (dev->flags & IFF_PROMISC) {
466                 /* promiscuous mode */
467                 priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
468         } else if (dev->flags & IFF_ALLMULTI) {
469                 priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
470         } else
471                 priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
472
473         ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
474 }
475
476 static void ether3_timeout(struct net_device *dev)
477 {
478         unsigned long flags;
479
480         del_timer(&priv(dev)->timer);
481
482         local_irq_save(flags);
483         printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
484         printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
485                 ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
486         printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
487                 ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
488         printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
489                 priv(dev)->tx_head, priv(dev)->tx_tail);
490         ether3_setbuffer(dev, buffer_read, priv(dev)->tx_tail);
491         printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
492         local_irq_restore(flags);
493
494         priv(dev)->regs.config2 |= CFG2_CTRLO;
495         priv(dev)->stats.tx_errors += 1;
496         ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
497         priv(dev)->tx_head = priv(dev)->tx_tail = 0;
498
499         netif_wake_queue(dev);
500 }
501
502 /*
503  * Transmit a packet
504  */
505 static int
506 ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
507 {
508         unsigned long flags;
509         unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
510         unsigned int ptr, next_ptr;
511
512         if (priv(dev)->broken) {
513                 dev_kfree_skb(skb);
514                 priv(dev)->stats.tx_dropped ++;
515                 netif_start_queue(dev);
516                 return 0;
517         }
518
519         length = (length + 1) & ~1;
520         if (length != skb->len) {
521                 if (skb_padto(skb, length))
522                         goto out;
523         }
524
525         next_ptr = (priv(dev)->tx_head + 1) & 15;
526
527         local_irq_save(flags);
528
529         if (priv(dev)->tx_tail == next_ptr) {
530                 local_irq_restore(flags);
531                 return 1;       /* unable to queue */
532         }
533
534         dev->trans_start = jiffies;
535         ptr              = 0x600 * priv(dev)->tx_head;
536         priv(dev)->tx_head = next_ptr;
537         next_ptr        *= 0x600;
538
539 #define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
540
541         ether3_setbuffer(dev, buffer_write, next_ptr);
542         ether3_writelong(dev, 0);
543         ether3_setbuffer(dev, buffer_write, ptr);
544         ether3_writelong(dev, 0);
545         ether3_writebuffer(dev, skb->data, length);
546         ether3_writeword(dev, htons(next_ptr));
547         ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
548         ether3_setbuffer(dev, buffer_write, ptr);
549         ether3_writeword(dev, htons((ptr + length + 4)));
550         ether3_writeword(dev, TXHDR_FLAGS >> 16);
551         ether3_ledon(dev);
552
553         if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
554                 ether3_outw(ptr, REG_TRANSMITPTR);
555                 ether3_outw(priv(dev)->regs.command | CMD_TXON, REG_COMMAND);
556         }
557
558         next_ptr = (priv(dev)->tx_head + 1) & 15;
559         local_irq_restore(flags);
560
561         dev_kfree_skb(skb);
562
563         if (priv(dev)->tx_tail == next_ptr)
564                 netif_stop_queue(dev);
565
566  out:
567         return 0;
568 }
569
570 static irqreturn_t
571 ether3_interrupt(int irq, void *dev_id, struct pt_regs *regs)
572 {
573         struct net_device *dev = (struct net_device *)dev_id;
574         unsigned int status, handled = IRQ_NONE;
575
576 #if NET_DEBUG > 1
577         if(net_debug & DEBUG_INT)
578                 printk("eth3irq: %d ", irq);
579 #endif
580
581         status = ether3_inw(REG_STATUS);
582
583         if (status & STAT_INTRX) {
584                 ether3_outw(CMD_ACKINTRX | priv(dev)->regs.command, REG_COMMAND);
585                 ether3_rx(dev, 12);
586                 handled = IRQ_HANDLED;
587         }
588
589         if (status & STAT_INTTX) {
590                 ether3_outw(CMD_ACKINTTX | priv(dev)->regs.command, REG_COMMAND);
591                 ether3_tx(dev);
592                 handled = IRQ_HANDLED;
593         }
594
595 #if NET_DEBUG > 1
596         if(net_debug & DEBUG_INT)
597                 printk("done\n");
598 #endif
599         return handled;
600 }
601
602 /*
603  * If we have a good packet(s), get it/them out of the buffers.
604  */
605 static int ether3_rx(struct net_device *dev, unsigned int maxcnt)
606 {
607         unsigned int next_ptr = priv(dev)->rx_head, received = 0;
608
609         ether3_ledon(dev);
610
611         do {
612                 unsigned int this_ptr, status;
613                 unsigned char addrs[16];
614
615                 /*
616                  * read the first 16 bytes from the buffer.
617                  * This contains the status bytes etc and ethernet addresses,
618                  * and we also check the source ethernet address to see if
619                  * it originated from us.
620                  */
621                 {
622                         unsigned int temp_ptr;
623                         ether3_setbuffer(dev, buffer_read, next_ptr);
624                         temp_ptr = ether3_readword(dev);
625                         status = ether3_readword(dev);
626                         if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
627                                 (RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
628                                 break;
629
630                         this_ptr = next_ptr + 4;
631                         next_ptr = ntohs(temp_ptr);
632                 }
633                 ether3_setbuffer(dev, buffer_read, this_ptr);
634                 ether3_readbuffer(dev, addrs+2, 12);
635
636 if (next_ptr < RX_START || next_ptr >= RX_END) {
637  int i;
638  printk("%s: bad next pointer @%04X: ", dev->name, priv(dev)->rx_head);
639  printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
640  for (i = 2; i < 14; i++)
641    printk("%02X ", addrs[i]);
642  printk("\n");
643  next_ptr = priv(dev)->rx_head;
644  break;
645 }
646                 /*
647                  * ignore our own packets...
648                  */
649                 if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
650                     !(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
651                         maxcnt ++; /* compensate for loopedback packet */
652                         ether3_outw(next_ptr >> 8, REG_RECVEND);
653                 } else
654                 if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
655                         unsigned int length = next_ptr - this_ptr;
656                         struct sk_buff *skb;
657
658                         if (next_ptr <= this_ptr)
659                                 length += RX_END - RX_START;
660
661                         skb = dev_alloc_skb(length + 2);
662                         if (skb) {
663                                 unsigned char *buf;
664
665                                 skb->dev = dev;
666                                 skb_reserve(skb, 2);
667                                 buf = skb_put(skb, length);
668                                 ether3_readbuffer(dev, buf + 12, length - 12);
669                                 ether3_outw(next_ptr >> 8, REG_RECVEND);
670                                 *(unsigned short *)(buf + 0)    = *(unsigned short *)(addrs + 2);
671                                 *(unsigned long *)(buf + 2)     = *(unsigned long *)(addrs + 4);
672                                 *(unsigned long *)(buf + 6)     = *(unsigned long *)(addrs + 8);
673                                 *(unsigned short *)(buf + 10)   = *(unsigned short *)(addrs + 12);
674                                 skb->protocol = eth_type_trans(skb, dev);
675                                 netif_rx(skb);
676                                 received ++;
677                         } else
678                                 goto dropping;
679                 } else {
680                         struct net_device_stats *stats = &priv(dev)->stats;
681                         ether3_outw(next_ptr >> 8, REG_RECVEND);
682                         if (status & RXSTAT_OVERSIZE)     stats->rx_over_errors ++;
683                         if (status & RXSTAT_CRCERROR)     stats->rx_crc_errors ++;
684                         if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
685                         if (status & RXSTAT_SHORTPACKET)  stats->rx_length_errors ++;
686                         stats->rx_errors++;
687                 }
688         }
689         while (-- maxcnt);
690
691 done:
692         priv(dev)->stats.rx_packets += received;
693         priv(dev)->rx_head = next_ptr;
694         /*
695          * If rx went off line, then that means that the buffer may be full.  We
696          * have dropped at least one packet.
697          */
698         if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
699                 priv(dev)->stats.rx_dropped ++;
700                 ether3_outw(next_ptr, REG_RECVPTR);
701                 ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
702         }
703
704         return maxcnt;
705
706 dropping:{
707         static unsigned long last_warned;
708
709         ether3_outw(next_ptr >> 8, REG_RECVEND);
710         /*
711          * Don't print this message too many times...
712          */
713         if (time_after(jiffies, last_warned + 10 * HZ)) {
714                 last_warned = jiffies;
715                 printk("%s: memory squeeze, dropping packet.\n", dev->name);
716         }
717         priv(dev)->stats.rx_dropped ++;
718         goto done;
719         }
720 }
721
722 /*
723  * Update stats for the transmitted packet(s)
724  */
725 static void ether3_tx(struct net_device *dev)
726 {
727         unsigned int tx_tail = priv(dev)->tx_tail;
728         int max_work = 14;
729
730         do {
731                 unsigned long status;
732
733                 /*
734                  * Read the packet header
735                  */
736                 ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
737                 status = ether3_readlong(dev);
738
739                 /*
740                  * Check to see if this packet has been transmitted
741                  */
742                 if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
743                     (TXSTAT_DONE | TXHDR_TRANSMIT))
744                         break;
745
746                 /*
747                  * Update errors
748                  */
749                 if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
750                         priv(dev)->stats.tx_packets++;
751                 else {
752                         priv(dev)->stats.tx_errors ++;
753                         if (status & TXSTAT_16COLLISIONS)
754                                 priv(dev)->stats.collisions += 16;
755                         if (status & TXSTAT_BABBLED)
756                                 priv(dev)->stats.tx_fifo_errors ++;
757                 }
758
759                 tx_tail = (tx_tail + 1) & 15;
760         } while (--max_work);
761
762         if (priv(dev)->tx_tail != tx_tail) {
763                 priv(dev)->tx_tail = tx_tail;
764                 netif_wake_queue(dev);
765         }
766 }
767
768 static void __init ether3_banner(void)
769 {
770         static unsigned version_printed = 0;
771
772         if (net_debug && version_printed++ == 0)
773                 printk(KERN_INFO "%s", version);
774 }
775
776 static int __devinit
777 ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
778 {
779         const struct ether3_data *data = id->data;
780         struct net_device *dev;
781         int i, bus_type, ret;
782
783         ether3_banner();
784
785         ret = ecard_request_resources(ec);
786         if (ret)
787                 goto out;
788
789         dev = alloc_etherdev(sizeof(struct dev_priv));
790         if (!dev) {
791                 ret = -ENOMEM;
792                 goto release;
793         }
794
795         SET_MODULE_OWNER(dev);
796         SET_NETDEV_DEV(dev, &ec->dev);
797
798         priv(dev)->base = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
799                                   ecard_resource_len(ec, ECARD_RES_MEMC));
800         if (!priv(dev)->base) {
801                 ret = -ENOMEM;
802                 goto free;
803         }
804
805         ec->irqaddr = priv(dev)->base + data->base_offset;
806         ec->irqmask = 0xf0;
807
808         priv(dev)->seeq = priv(dev)->base + data->base_offset;
809         dev->irq = ec->irq;
810
811         ether3_addr(dev->dev_addr, ec);
812
813         init_timer(&priv(dev)->timer);
814
815         /* Reset card...
816          */
817         ether3_outb(0x80, REG_CONFIG2 + 4);
818         bus_type = BUS_UNKNOWN;
819         udelay(4);
820
821         /* Test using Receive Pointer (16-bit register) to find out
822          * how the ether3 is connected to the bus...
823          */
824         if (ether3_probe_bus_8(dev, 0x100) &&
825             ether3_probe_bus_8(dev, 0x201))
826                 bus_type = BUS_8;
827
828         if (bus_type == BUS_UNKNOWN &&
829             ether3_probe_bus_16(dev, 0x101) &&
830             ether3_probe_bus_16(dev, 0x201))
831                 bus_type = BUS_16;
832
833         switch (bus_type) {
834         case BUS_UNKNOWN:
835                 printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
836                 ret = -ENODEV;
837                 goto free;
838
839         case BUS_8:
840                 printk(KERN_ERR "%s: %s found, but is an unsupported "
841                         "8-bit card\n", dev->name, data->name);
842                 ret = -ENODEV;
843                 goto free;
844
845         default:
846                 break;
847         }
848
849         if (ether3_init_2(dev)) {
850                 ret = -ENODEV;
851                 goto free;
852         }
853
854         dev->open               = ether3_open;
855         dev->stop               = ether3_close;
856         dev->hard_start_xmit    = ether3_sendpacket;
857         dev->get_stats          = ether3_getstats;
858         dev->set_multicast_list = ether3_setmulticastlist;
859         dev->tx_timeout         = ether3_timeout;
860         dev->watchdog_timeo     = 5 * HZ / 100;
861
862         ret = register_netdev(dev);
863         if (ret)
864                 goto free;
865
866         printk("%s: %s in slot %d, ", dev->name, data->name, ec->slot_no);
867         for (i = 0; i < 6; i++)
868                 printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
869
870         ecard_set_drvdata(ec, dev);
871         return 0;
872
873  free:
874         if (priv(dev)->base)
875                 iounmap(priv(dev)->base);
876         free_netdev(dev);
877  release:
878         ecard_release_resources(ec);
879  out:
880         return ret;
881 }
882
883 static void __devexit ether3_remove(struct expansion_card *ec)
884 {
885         struct net_device *dev = ecard_get_drvdata(ec);
886
887         ecard_set_drvdata(ec, NULL);
888
889         unregister_netdev(dev);
890         iounmap(priv(dev)->base);
891         free_netdev(dev);
892         ecard_release_resources(ec);
893 }
894
895 static struct ether3_data ether3 = {
896         .name           = "ether3",
897         .base_offset    = 0,
898 };
899
900 static struct ether3_data etherb = {
901         .name           = "etherb",
902         .base_offset    = 0x800,
903 };
904
905 static const struct ecard_id ether3_ids[] = {
906         { MANU_ANT2, PROD_ANT_ETHER3, &ether3 },
907         { MANU_ANT,  PROD_ANT_ETHER3, &ether3 },
908         { MANU_ANT,  PROD_ANT_ETHERB, &etherb },
909         { 0xffff, 0xffff }
910 };
911
912 static struct ecard_driver ether3_driver = {
913         .probe          = ether3_probe,
914         .remove         = __devexit_p(ether3_remove),
915         .id_table       = ether3_ids,
916         .drv = {
917                 .name   = "ether3",
918         },
919 };
920
921 static int __init ether3_init(void)
922 {
923         return ecard_register_driver(&ether3_driver);
924 }
925
926 static void __exit ether3_exit(void)
927 {
928         ecard_remove_driver(&ether3_driver);
929 }
930
931 module_init(ether3_init);
932 module_exit(ether3_exit);
933
934 MODULE_LICENSE("GPL");